Google Voice quirk: same number, many different CBCAD recordings

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So I dial the same number multiple times with Google Voice (in this case 402-341-9990), and I get multiple different CBCAD recordings, with different trailer codes, different voices, etc. When dialing that number from my phone at work (which is served by a Cox Communications SIP trunk), I consistently get the same NIS recording. Does this happen because Google Voice is terminating the calls via several different providers, and they all have their own recording in response to the cause code that is returned?

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That would make sense, yeah. For whatever it's worth, the Qwest 5ESS you're calling passes the not in service message back over an out of band channel. Some routes might just be responding to that their own way. I tried checking a few cheap carriers, but didn't have any luck. For whatever it's worth, I think Google Voice uses bandwidth.com or Level 3 for outbound stuff.